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nixos/systemd-networkd: add NFTSet related options #332777

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nixos/systemd-networkd: add NFTSet related options #332777

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mvnetbiz
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@mvnetbiz mvnetbiz commented Aug 6, 2024 •
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Description of changes

Allow setting NFTSet= option in systemd-netword network files. This option is for automatically adding the interface's address, prefix, or index to a named nftables set. It is valid under [Address] for static addresses, as well as the various sections for dynamic configuration (DHCP, etc.)

Added a NixOS test that configures a machine that uses NFTSet on a statically configured address section, as well as a DHCPv4 section, and checks that both nft sets are modified by testing nft rules that match on the sets.

Things done

Tested that it works on a system with nftables configured.

  • Built on platform(s)
    • x86_64-linux
    • aarch64-linux
    • x86_64-darwin
    • aarch64-darwin
  • For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
    • sandbox = relaxed
    • sandbox = true
  • Tested, as applicable:
  • Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
  • Tested basic functionality of all binary files (usually in ./result/bin/)
  • 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
    • (Package updates) Added a release notes entry if the change is major or breaking
    • (Module updates) Added a release notes entry if the change is significant
    • (Module addition) Added a release notes entry if adding a new NixOS module
  • Fits CONTRIBUTING.md.

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@philiptaron philiptaron self-requested a review August 6, 2024 18:08
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philiptaron commented Aug 6, 2024 •
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Documentation is here: https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#NFTSet=source:family:table:set

NFT is https://netfilter.org/projects/nftables/index.html

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mvnetbiz commented Aug 6, 2024

Does this need any validation on the option or a nixos test? This seems similar to recent changes like #318604.

philiptaron
philiptaron reviewed Aug 6, 2024
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I'd love to see a NixOS test that exercised these options. I'd also love to see a validator or a structured Nix type that reflects the four possible fields of source, family, table, and set.

nixos/modules/system/boot/networkd.nix
@@ -737,6 +737,7 @@ let
"ManageTemporaryAddress"
"AddPrefixRoute"
"AutoJoin"
"NFTSet"
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Address documentation: https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#NFTSet=source:family:table:set

Do you think you need a validator? One seems possible given the documentation above.

nixos/modules/system/boot/networkd.nix
@@ -864,6 +865,7 @@ let
"FallbackLeaseLifetimeSec"
"Label"
"Use6RD"
"NFTSet"
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DHCPv4 documentation: https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#NFTSet=

nixos/modules/system/boot/networkd.nix
@@ -913,6 +915,7 @@ let
"IAID"
"UseDelegatedPrefix"
"SendRelease"
"NFTSet"
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DHCPv6 documentation: https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#NFTSet=1

nixos/modules/system/boot/networkd.nix
@@ -937,6 +940,7 @@ let
"Token"
"ManageTemporaryAddress"
"RouteMetric"
"NFTSet"
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DHCPPrefixDelegation documentation: https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#NFTSet=2

nixos/modules/system/boot/networkd.nix
@@ -964,6 +968,7 @@ let
"UseRoutePrefix"
"Token"
"UsePREF64"
"NFTSet"
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IPv6AcceptRA documentation: https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#NFTSet=3

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mvnetbiz commented Aug 6, 2024

I can add a validator.

@mvnetbiz mvnetbiz requested a review from a team as a code owner August 6, 2024 21:22
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mvnetbiz commented Aug 6, 2024 •
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I added a check to validate that all fields are present. It looks like one of the more complex checks for a string option. I'm not sure if I should keep it as several assertions like this, or if I should build a string so it's kept to a single trace line? Also not sure if systemd-lib.nix is the appropriate place for this since it will probably stay specific to the one module.

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mvnetbiz commented Aug 6, 2024

@philiptaron I am not sure how I could use a "structured Nix type" where the option type is already a unitOption.

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@mvnetbiz I'm about to be away from a computer for a week-ish. Please feel free to enlist someone else to keep reviewing! I like the direction I see on my phone but can't sign off due to inability to test.

@mvnetbiz mvnetbiz requested a review from mweinelt August 7, 2024 18:58
@mvnetbiz
nixos/systemd-networkd: add NFTSet related options
c5cd3c2 
Includes NixOS test and validation on required fields.
r-vdp
r-vdp reviewed Aug 7, 2024
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nixos/tests/systemd-networkd-nftset.nix
# added to another. The sets are used by one rule that blocks connections to
# the static address, and one rule that blocks connections to the DHCP address.
# It is tested that the expected connections succeed or fail from another host.
import ./make-test-python.nix (
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The manual specifies a different way of defining tests, based on runTest instead of importing this.
See https://nixos.org/manual/nixos/stable/#sec-call-nixos-test-in-nixos

@mvnetbiz mvnetbiz marked this pull request as draft August 8, 2024 00:09
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